Peterborough keeper Joe Lewis believes Posh will "destroy" the opposition if they put together a full 90-minute performance.
Gary Johnson's side climbed to the top of League One at the weekend after a 5-2 win over Oldham but they have made a habit of falling behind in sloppy starts to games.
Lewis said: "We know we cannot afford to keep falling behind and having to do things the hard way.
"We have made no secret of the fact that our target is promotion and we found out last season in the Championship how hard it is to recover from going behind.
"It is very difficult for us to put our finger on the problem in the first half of matches. We must be the fittest team in the league which is a reason why we have done so well in the second half of games.
"If we can bring our second-half form to the table right from the first whistle I am sure we will destroy teams."